Considering that I have many years of industry experience in designing adaptive equalizers and carrier and symbol
timing recovery tracking algorithms at the receiver, and building the nonlinear polynomial model (or Volterra
series) of the power amplifiers at the transmitter, I present a proposal to this course by adding some practical
algorithms that are used and developed in modern digital communications, especially in Chapters 7 & 10 of
maximum likelihood and least squares estimations. The purpose for adding these practical algorithms is to tell
students why and how the ML and LS estimation methods are used in modern digital communication systems in
order to enhance their interest in this course. The contents of the proposal for these two Chapters are described as
follows:
1. Maximum Likelihood (ML) Estimation (Ch.7)
A typical application of ML estimation is the optimum detector in digital communications. A new teaching method
that I would plan in this chapter is to apply the ML estimation to the optimum detector at the receiver of digital
communication systems.
The maximum of likelihood function over the transmitted nth signal symbol is equivalent to minimize the
Euclidean distance when the transmitted M signal symbols are equally probably a priori probability. Euclidean
means to find one of the transmitted signal symbols, which is closest in distance to the currently received signal
symbols. Furthermore, the minimum of the Euclidean distance is equivalent to the largest correlation metric at the
receiver, called the correlation based optimum receiver that is widely used in digital communications.
Next content would be added in this Chapter is carrier frequency offset (CFO) estimation in OFDM systems by
using ML estimation based on training symbols in the received frame. This ML based estimation is widely used in
the IEEE 802.11 Wi-Fi OFDM signal reception to achieve the fast and accurate CFO estimation.
2. Least Squares (LS) Estimation (Ch. 8)
Besides teaching the content required in this topic, I also plan to add one practical design example by using the LS
estimation to solve the practical problem of the nonlinear behavioral modelling for the power amplifier. This
practical example is to extract the coefficients of the Volterra series that is used to approximate to the power
amplifier’s characteristics from the measured (or collected) data at the input and output of the power amplifier.
This behavioral model is widely used for linearizing power amplifier in order to compensate for the power
amplifier’s nonlinear property by inserting a predistorter prior to the power amplifier. Thus, students could obtain
the latest knowledge how to model a nonlinear device in practice by using LS algorithm. Actually, Chapter 5 of my
book describes the LS algorithm in more detail.
Note: Teaching new contents above in these two Chapters will be limited within the required time period or the
total of 3 weeks if extra time is not allowed.
1. Minimum Variance Unbiased Estimation (MVU) (Ch.2) : ~ 1 week
2. Cramer-Rao Lower Bound (scalar & vector cases) (Ch.3) : ~ 2 weeks
3. Linear Models (Ch.4) : ~ 1 week
4. Sufficient Statistics, Neyman-Fisher Factorization Theorem (Ch.5) : ~1 week
5. Best Linear Unbiased Estimators (BLUE) (Ch.6) : ~ 1 week
6. Maximum Likelihood Estimation (Ch.7) : ~ 2 weeks
7. Least Squares Estimation – Geometrical Interpretations (Ch.8) : ~ 1 week
8. Bayesian Estimation (Ch.10) : ~ 1 week
9. Maximum Aposteriori (MAP) Estimation (Ch.11) : ~ 1 week
10. Linear Minimum Mean Square Error (LMMSE) Estimation (Ch.12) : ~ 2 weeks
11. Overview of Detection Techniques : ~ 1 week